Always Update the View From the Main Thread

I wish I’d read this years ago:

AppKit, the GUI framework, is not thread safe. In order for things to work properly, you (almost) always need to update GUI classes from the main thread

—Dave Dribin (slightly edited)

I’ve run into UI + threading problem before, but I’d just never seen this limitation of AppKit spelled out.

Dave’s article explains how to call code on the main thread better then I can.